Square lampshade



FIG. 1 is a front perspective view of a square lampshade showing my new design;

FIG. 2 is a front elevational view thereof; the opposite side being a mirror image of the shown;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a square lampshade, as shown and described. 